Circulator.



N. M. LA PORTE.

CIRCULATOR.

APPLICATION FILED JULY29, 1915.

1,183,303. I Patented May16,191(5.

2 SHEETSSHEET I.

1 J Na /U6 A N M, LA FORTE.

CIRCULATOR.

APPLICATION HLED JULY29. I915.

flatnted May us, 1911;.

2 SHEETS-SHEET 2.

( IIIIII il NORBERT M LA PORTE, OF BALTIMORE, MARYLAND, ASSIGNOR TO THE MOTOR COOLING SYSTEMS COMPANY, A CORPORATION OF MARYLAND.

CIRCULATOR.

Specification of Letters Patent. Patented May 16 1916 Application filed July 29, 1915. Serial No. 42,610.

To all whom it may concern:

Be it known that I, Nonnnnr M. LA Ponre, a citizen of the United States of America, residing in the city of Baltimore, State of Maryland, have invented certain new and useful Improvements in Circulators, of which the following is a specification.

This invention relates to a new and improved device for circulating the water used for cooling the combustion chamber of a gasolene engine, the invention having particular application to the ordinary type of water-cooled engine used to propel road vehicles. Enginesoperated in this capacity are subject to conditions not ordinarily encountered in stationary or marine work. One of the principal differences is found in the supply of cooling water. \Vith marine engines, an unlimited water supply is at hand and it is only necessary to maintain the flow through the jacket to give the desired cooling; with stationary engines, conditions are usually the same. Of course, the actual cooling effect may be varied by varying the speed of circulation. IVith motor driven vehicles, these conditions are entirely different. A comparatively small supply of water is carried and there is a radiator at the front of the machine to disperse the heat. To produce the desired cooling effect, the cooling water is passed through the cylinder jacket to the top of the radiator whence it flows downward through numerous fine tubes which are air cooled.

The present device serves to increase the speed of circulation of the cooling water and thus to increase the cooling effect.

The circulator-of the application is of the type having an ejector action, a portion of the exhaust gases being introduced into the cooling water and discharged in the direction of thermo-siphoniccirculation. These circulator nozzles have in the past been placed at various points in the radiator connections, principally in the bottom connection but, with the single outlet pipe from the radiator, the circulation is not always uniform, it being found that there are hot and cold spots in the radiating surface. However, I find that by placing the gas nozzle in the bottom chamber of the radiator, directed toward the outlet opening, this objection is obviated and the radiating action is rendered more efficient because it is uniform. The circulating action is set up inside the bottom chamber of the radiator to which all the tubes or cells are connected, and in this way the circulating effect is transmitted to all parts of the radiator.

In the accompanying drawings, I have illustrated so much of an automobile engine and radlator together with a circulator constructed in accordance with my invention, as 1s necessary to a full comprehension of the nature and operation of the device.

Figure 1 is a detail View showing in transverse section the bottom chamber of a radiator and the adjacent portions of one row of tubes; the outlet to the bottom connection is also shown in section and a'portion of the connection in elevation, and there is a gas nozzle placed in the radiator chamber in accordance with my invention; Fig. 2 is a side elevation of an engine and radiator fully equipped with my circulating device; Fig. 3 is a front elevation of a radiator supplied with my circulator, a portion of the radiator being broken away to show the gas tube; and Fig. 4 is a detail view showing a portion of the gas tube and non-return valve.

Referring to the drawings by numerals; the 1l lustration includes an engine casting 1, a cylinder head 2, a radiator 3, a fan 4 and an exhaust manifold 5.

The radiator shown consists of a top chamber 6 and a bottom chamber 7 connected by a series of small tubes 8 or other suitable means for providing a. number of attenuated passages for thewater from the top to the bottom chambers of the radiator whereby it may be subjected to an effective c0oling draft. tween the radiator and water jacket at the top at 9 and at the bottom at 10 to give the usual thermo-siphonic circulation, and this effect is assisted rather than supplanted by the device of the invention.

In the lower chamber 7, disposed toward the bottom connection 10, I have provided a discharge nozzle 11 to which a portion of the exhaust gases from the exhaust manifold 5 are led by suitable means, as a small pipe 12, shown as connected to the exhaust'manifold between the third and fourth cylinders. In order to prevent the back flow of gases between exhaust impulses or when the engine rocks backward in starting or stopping, I provide a non-return valve in the gas pipe 12. This, in the present instance, is shown as a ball valve 13 which,'for convenience, is

Connections are provided belocated at the end of a short length of pipe 14.- which is tapped into the manifold, the tube 12 being connected to the pipe 14 by a suitable fitting 15 having an enlarged chamber 16 for the ball valve and a reduced threaded portion 17 to receive a threaded sleeve 18 which serves to force the enlarged end of the pipe 12 into contact with the conical end 19 of the fitting 15. The exhaust gases which are led through the tube 12 are ordinarily sufiiciently cooled in passing.

However, in very hot climates, or under other adverse conditions, it might be found that there is some heating effect from the gases discharged into the cooling water. To overcome this, or under other circumstances to obtain greater cooling, the pipe 12 may be formed in a coil 20 immediately in the rear of the fan to provide any degree of cooling of the gases which may be desired.

The operation of the device is apparent. When the engine is idle or running with light loads, the heating effect is low and the pressure in the manifold is insufiicient to cause any considerable discharge of gas through the pipe 12; No cooling, in addition to that resulting from the thermo-siphonic action, is necessary and none is bad, but when the engine is working under heavy loads, with a wide throttle opening, the pressure in the manifold is correspondingly great and the discharge of exhaust gases through the pipe 12 and the nozzle 11 reaches its maximum. Under these circumstances, the waterfrom the chamber 7 is forced into the outlet 10. There is a corresponding suction or reduction of pressure at the bottom of each of the radiator tubes. In this way an increased circulation is provided under heavy load conditions, giving a cooling effect corresponding to the additional heating resulting from the extra load on the engine.

I have thus described my invention specifically and in detail in order that its nature and operation may be fully understood;

however, the specific terms herein are used in their description rather than in their limiting sense and the scope of the invention is defined in the claims.

I claim 1.111 combination, an internal combustion engine having a water jacket, a radiator with top and bottom connections to the water jacket, the radiator having a bottom chamber, a gas nozzle in the bottom chamber directed toward the outlet to the bottom connection, and means connecting the gas nozzle to the exhaust manifold.

2. In combination, 'an internal combustion engine having a water jacket, a radiator. top and bottom connections between the water jacket and radiator, a gas nozzle in the bottom part of the radiator directed toward the bottom connection, and means for leading exhaust gases from the exhaust pipe to the nozzle.

Signed. by me at Baltimore, Maryland," this 9th day of July 1915.

NORBERT M.-LA roars.

Witnesses:

EDWARD L. BASH, ALICE G. DONEGAN. 

